Freezer is too cold

Brand: GE
Model Number: PSS27NGMAWW
Main Symptom: Freezer colder Fridge reahces to normal temperature.
What happens & when:

I have Replaced main control board all Temperature sensors Evaporator fan. Evopartor Thermostat and heater also Air Damper is replaced. Freezer Reaches to almost -18 degree F Fridge side is normal.

Error Code (if any):
Parts or tests already tried:
Photos / video link:

Is the user interface allowing the temps to be changed and responding correctly? With everything you’ve replaced you’re down to that or a wiring fault somewhere and most of that wiring is going to be non-serviceable.

You can use the diagnostics test section starting on page 32 of the service manual I’ve attached below to check various component functions and readings, that might tell you where to look.

31-9072.pdf (1.7 MB)